Thanks for the explanation of Li Jingles - that helps.
Yes, I loaded up several fixtures when on household wifi, then went around them all and reset DMX addresses on the units to match those on the App. Checked all the modes too.
I've since stripped all but two fixtures off, just basic LED pars and wired only them in. Still nothing.
I'm wondering if there's some setting I've inadvertently changed or something.
Oh yes, I've also been back through the Hardware manager , put the unit back to Factory settings, checked again for latest firmware and started over.
Think I'll swap out the dmx cables next just in case.
If that doesn't work - well, they say you only get one chance to make a good first impression and I'll be going back to analogue control - shame because this would have been really convenient.
Thanks for you time and input!